Vacuum milking-machine



c. H. DAVIS.

VACUUM MILKING MACHINE.

APPLICATION FILED JAN. 4, I917.

Patented Sept. 21, 1920 Eva/afar flaa/ae Hudson flaws.

BYiJiV ATTaR/VEY,

To all whom it may concern:

CLAUDE HUDSON DAVIS, 01' WANGANUI, NEW ZEALAN D.

VACUUM MILKING-IlIACHINE.

4, 1917. Serial No. 140,569.

Be it known that I, CLAUDE HUDSON .DAVIS, a subject of the King of Great Britain and Ireland, and residing at Wanganui, in the Dominion of New Zealand, have invented a new and useful Vacuum Milking- Machine; and I do hereby declare the fol-' clear, and exact descriptionof the same.

The present application is a division of my application, filed November 11, 1915, and bearing the Serial Number 60893.

This invention relates to vacuum milking machines of the class wherein a separate milk receiving can is employed for each bail.

The object'of the present invention is to provide a pulsator operable automatically by the vacuum in the vacuum pipe and lolowing to be a full cated upon the lid of the can for the purpose of operating the teat-cups.

The invention will be described with the aid of the accompanying drawings and the novel features-thereof pointed out in theclaims.

On the drawings Figure 1 is a view showing the methodof arrangement of the pulsator upon a mllk can.

1 Fig. 2 is a longitudinal section of the pulsator. Fig. 3 is a cross section thereof.

Fig. 4 is a view showing the pulsator piston at one end of its stroke.

Fig. 5 is a cross sectional view of the pulsator piston.

Referring to the drawings a vacuum plpe 5 (see Fig. 1) leads from the pump 6 and extends throughout the byre. 7

.,Branch vacuum pipes lead from the pipe 5 to milk receiving cans 115 in the usual manner.

A flexible milk connection 116 leads from the can 115 to the milk portion of the claw.

An automatic pulsator 117 located upon the top of the can and in vacuum communication therewith has a flexible connection 118 leading to the vacuum portion of the teat-cup claw.

The construction of the pulsator 117 is clearly shown in Figs. 2 to 5 and comprises a cylindrical casing 119 having an integral branch 120 which forms a vacuum connection with the can 115. An air-tight joint is formed between the branch-and the can by a rubber washer 121 resting between the topof the can and a shoulder 122 formed upon the branch 120. A port 123 makes communication between the interior of the branch and the interior of the c linder.

A nipple 124.is formed upon t e exterior of the cylinder (see Fig. 3) its passage endlng 1n a port 125 leading to the interior of the cylinder. A double ended piston 126 is located within the cylinder as shown. The space between the two ends is open to the atmosphere through an o ening 127 in the top of the cylinder 119. 'l piston are connected by an integral portion 128. (See Fi .3).

A longitudinal passa e 129 is formed in the portion 128 and a apted to cover the port 123 with which it is always in communication.

An air'passage 130 (see Figs. 2 and 5) upon the lower side of the portion128 com- 'municates with the space between the two piston ends and is open to the atmosphere through the same. 1

A slide valve 131 slides upon a valve face 132 of the portion 128 and is guided laterally by cheeks 133 integral with the portion 128.

A pin 143 passing through the cheeks limits the travel of the valve 131.

' An orifice 134 leads from the passage 129 and is in constant communication with a Specification of Letters Patent. Patent d Sept. 21, 1920 0rigina1 application filed November 11, 1915, Serial No. 60,893. Divided and this application filed January he. two ends of the longitudinal passage 135 formed in the un-- der side of the slide valve. Ports 136 and 137 lead respectively from the piston ends to the valve face as clearly shown in Fig; 2.

A member 138 pivoted upon a pin 139 threaded into upwardly extending members 142 of the cylinder carries a point hardened wiper 140. The member 138 is normally retained in a vertical position 'b means of a coil spring 141arranged as s own.

In Fig. 2 vacuum obtains in one end of the cylinder through the port 123, passa e 129, orifice 134, passage 135, and port 13 The opposite end of the cylinder is open to the atmosphere through the port 136 and the piston therefore travels in the direction of of the arrow.

As the piston continues its stroke the point of the wiper 140 will ride over the pin 7 143 and by the time the piston has reached the end of its stroke (as shown in Fig. 4) the point will have left the pin 143 and be caused by the spring 141' to tend to resume its normal position carrying with it the slide we I ' sage 135', orifice 134, and passage129, w ile the port 137 willbe open to the atmosphere,

consequently the piston will commence to return. It will be readily understood that the action of the slide valve at the opposite end of the stroke is similar as above described.

As the piston moves forward in the direction of the arrow in Fig.2 the air passage 130, will cover the port 125 and atmospher ic pressure will cause the linin of theteatcups to collapse inthe usua well known manner. Upon the return stroke oi the piston after'the mid-position of the piston has been reached the am passage 130 will be cut of from the port 125 and 'the passage 129 brought into communication with the port 125.. Vacuum will then obtain behind the rubber-lining of the teat-cups.

. plston.

A. screw 14% (see Fig. 3) threaded into the portion 128 is employed to regulate the or1-.

ca 134 and thus govern the speed of the Whatllclaim is:

I 1. In a milking machine, a milk receiving can, a pulsator comprisin a cylinder open at its middle portion tot e air, a vacuum bonnection to said cylinder from said can, a double-ended piston located within said cyl' inder and having a space open to the atmosphere between the ends of said piston and having ports communicating with the ends thereof and a passage in communication with vacuum, a slide valve alternatel mitting air and vacuum to the ends oft said piston in order to cause it toreciprocate within said cylinder, and means ion-operat- "ing said valve upon the reciprocation of said piston.

'2. Ina milking machine, a'milk receiving can, a pulsator comprising a cylinder open at its middle portion'to the air, a vacuum connection to said cylinder from said can, a double-ended piston located within said cyl inder and having a space open to the atmoshere between the ends'of the piston, a valveace between the ends of said piston, a nipple from said cylinder adapted to be con-. nected to the teat-cup linings, said piston being adapted-to alternately admit vacuum and air to said nip le,-said piston having a port leading to t c said valve face and adapted for constant communication with said vacuum connection, ports leading from the ends of said piston to the said valve face,

a slide valve controlling "said ports leadingv to said valve face and means for operating piston, substantially as set forth.-

naeaeae saidslide valve upon the reciprocation of the said piston, substantially as set forth,

3. in a milking machine, a'milk receiving can, a pulsator comprising a cylinder open admit air to the nipple leading to the teatcup linings, said piston having ports leading to the ends thereof, a slide valve controlling said ports to admit vacuum and air alternately to the ends of the piston in order to cause it to reciprocate within said cylinder,

and said piston being adapted to admit vacuum to said nipple alternately with the air, substantially as set forth.

4. In a milking machine, a milk receiving can, a pulsator comprising a cylinder open at its middle portion to the air, a vacuum connection to said cylinder from said can, a double-ended piston located within said cylinder and havmga space open to the atmosphere between the ends of said piston, and having .ports communicating with the ends thereof and a passage in communication with vacuum, a slide valve adapted alternately to admit air and vacuum to the ends of said piston in order to cause it to reciprocate within said cylinder,"a spring operated member pivote in said cyllnder, a wiper. located at the end'of saidmemher whereby the said slide valve is caused to return-when, said piston has completed its stroke, substantially as set forth.

5. lln a milking machine, a milk receiving can, a pulsator comprising a cylinder open at its middle portion to the air, a vacuum connection to said 0 linder from said milk receivin can, a den le-ended piston within said cylmder having a space between the ends open to the atmosphere and a port leading from said space. open to vacuum and ports between the ends of said piston and said open space, a slide valve controlling said ports and means for operating said slide valve upon the reciprocationof the In testimony whereof, l have signed my name to this specification in the presence of two subscribing witnesses.

CLAUDE. nnnsquinavrs.

Witnesses:

G. S. GoRnoN, A. D. Baonm. 

